Instead of freaking out because ALL THESE PEOPLE ARE ON OUR PROPERTIES (HORROR), use the opportunity to talk to them. Be friendly and welcoming. Take an interest in what they're doing. Invite them in for refreshments and tell them of your parish's activities that they might be interested in. Give them your parish's facebook page to stay abreast of activities that will interest them.
Good grief! Does the Holy Spirit have to knock you off your donkey! Pokemon Go may be a godsend.